1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * net/sched/cls_matchll.c Match-all classifier 4 * 5 * Copyright (c) 2016 Jiri Pirko <jiri@mellanox.com> 6 */ 7 8 #include <linux/kernel.h> 9 #include <linux/init.h> 10 #include <linux/module.h> 11 #include <linux/percpu.h> 12 13 #include <net/sch_generic.h> 14 #include <net/pkt_cls.h> 15 16 struct cls_mall_head { 17 struct tcf_exts exts; 18 struct tcf_result res; 19 u32 handle; 20 u32 flags; 21 unsigned int in_hw_count; 22 struct tc_matchall_pcnt __percpu *pf; 23 struct rcu_work rwork; 24 bool deleting; 25 }; 26 27 static int mall_classify(struct sk_buff *skb, const struct tcf_proto *tp, 28 struct tcf_result *res) 29 { 30 struct cls_mall_head *head = rcu_dereference_bh(tp->root); 31 32 if (unlikely(!head)) 33 return -1; 34 35 if (tc_skip_sw(head->flags)) 36 return -1; 37 38 *res = head->res; 39 __this_cpu_inc(head->pf->rhit); 40 return tcf_exts_exec(skb, &head->exts, res); 41 } 42 43 static int mall_init(struct tcf_proto *tp) 44 { 45 return 0; 46 } 47 48 static void __mall_destroy(struct cls_mall_head *head) 49 { 50 tcf_exts_destroy(&head->exts); 51 tcf_exts_put_net(&head->exts); 52 free_percpu(head->pf); 53 kfree(head); 54 } 55 56 static void mall_destroy_work(struct work_struct *work) 57 { 58 struct cls_mall_head *head = container_of(to_rcu_work(work), 59 struct cls_mall_head, 60 rwork); 61 rtnl_lock(); 62 __mall_destroy(head); 63 rtnl_unlock(); 64 } 65 66 static void mall_destroy_hw_filter(struct tcf_proto *tp, 67 struct cls_mall_head *head, 68 unsigned long cookie, 69 struct netlink_ext_ack *extack) 70 { 71 struct tc_cls_matchall_offload cls_mall = {}; 72 struct tcf_block *block = tp->chain->block; 73 74 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack); 75 cls_mall.command = TC_CLSMATCHALL_DESTROY; 76 cls_mall.cookie = cookie; 77 78 tc_setup_cb_destroy(block, tp, TC_SETUP_CLSMATCHALL, &cls_mall, false, 79 &head->flags, &head->in_hw_count, true); 80 } 81 82 static int mall_replace_hw_filter(struct tcf_proto *tp, 83 struct cls_mall_head *head, 84 unsigned long cookie, 85 struct netlink_ext_ack *extack) 86 { 87 struct tc_cls_matchall_offload cls_mall = {}; 88 struct tcf_block *block = tp->chain->block; 89 bool skip_sw = tc_skip_sw(head->flags); 90 int err; 91 92 cls_mall.rule = flow_rule_alloc(tcf_exts_num_actions(&head->exts)); 93 if (!cls_mall.rule) 94 return -ENOMEM; 95 96 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack); 97 cls_mall.command = TC_CLSMATCHALL_REPLACE; 98 cls_mall.cookie = cookie; 99 100 err = tc_setup_offload_action(&cls_mall.rule->action, &head->exts, 101 cls_mall.common.extack); 102 if (err) { 103 kfree(cls_mall.rule); 104 mall_destroy_hw_filter(tp, head, cookie, NULL); 105 106 return skip_sw ? err : 0; 107 } 108 109 err = tc_setup_cb_add(block, tp, TC_SETUP_CLSMATCHALL, &cls_mall, 110 skip_sw, &head->flags, &head->in_hw_count, true); 111 tc_cleanup_offload_action(&cls_mall.rule->action); 112 kfree(cls_mall.rule); 113 114 if (err) { 115 mall_destroy_hw_filter(tp, head, cookie, NULL); 116 return err; 117 } 118 119 if (skip_sw && !(head->flags & TCA_CLS_FLAGS_IN_HW)) 120 return -EINVAL; 121 122 return 0; 123 } 124 125 static void mall_destroy(struct tcf_proto *tp, bool rtnl_held, 126 struct netlink_ext_ack *extack) 127 { 128 struct cls_mall_head *head = rtnl_dereference(tp->root); 129 130 if (!head) 131 return; 132 133 tcf_unbind_filter(tp, &head->res); 134 135 if (!tc_skip_hw(head->flags)) 136 mall_destroy_hw_filter(tp, head, (unsigned long) head, extack); 137 138 if (tcf_exts_get_net(&head->exts)) 139 tcf_queue_work(&head->rwork, mall_destroy_work); 140 else 141 __mall_destroy(head); 142 } 143 144 static void *mall_get(struct tcf_proto *tp, u32 handle) 145 { 146 struct cls_mall_head *head = rtnl_dereference(tp->root); 147 148 if (head && head->handle == handle) 149 return head; 150 151 return NULL; 152 } 153 154 static const struct nla_policy mall_policy[TCA_MATCHALL_MAX + 1] = { 155 [TCA_MATCHALL_UNSPEC] = { .type = NLA_UNSPEC }, 156 [TCA_MATCHALL_CLASSID] = { .type = NLA_U32 }, 157 [TCA_MATCHALL_FLAGS] = { .type = NLA_U32 }, 158 }; 159 160 static int mall_set_parms(struct net *net, struct tcf_proto *tp, 161 struct cls_mall_head *head, 162 unsigned long base, struct nlattr **tb, 163 struct nlattr *est, u32 flags, u32 fl_flags, 164 struct netlink_ext_ack *extack) 165 { 166 int err; 167 168 err = tcf_exts_validate_ex(net, tp, tb, est, &head->exts, flags, 169 fl_flags, extack); 170 if (err < 0) 171 return err; 172 173 if (tb[TCA_MATCHALL_CLASSID]) { 174 head->res.classid = nla_get_u32(tb[TCA_MATCHALL_CLASSID]); 175 tcf_bind_filter(tp, &head->res, base); 176 } 177 return 0; 178 } 179 180 static int mall_change(struct net *net, struct sk_buff *in_skb, 181 struct tcf_proto *tp, unsigned long base, 182 u32 handle, struct nlattr **tca, 183 void **arg, u32 flags, 184 struct netlink_ext_ack *extack) 185 { 186 struct cls_mall_head *head = rtnl_dereference(tp->root); 187 struct nlattr *tb[TCA_MATCHALL_MAX + 1]; 188 struct cls_mall_head *new; 189 u32 userflags = 0; 190 int err; 191 192 if (!tca[TCA_OPTIONS]) 193 return -EINVAL; 194 195 if (head) 196 return -EEXIST; 197 198 err = nla_parse_nested_deprecated(tb, TCA_MATCHALL_MAX, 199 tca[TCA_OPTIONS], mall_policy, NULL); 200 if (err < 0) 201 return err; 202 203 if (tb[TCA_MATCHALL_FLAGS]) { 204 userflags = nla_get_u32(tb[TCA_MATCHALL_FLAGS]); 205 if (!tc_flags_valid(userflags)) 206 return -EINVAL; 207 } 208 209 new = kzalloc(sizeof(*new), GFP_KERNEL); 210 if (!new) 211 return -ENOBUFS; 212 213 err = tcf_exts_init(&new->exts, net, TCA_MATCHALL_ACT, 0); 214 if (err) 215 goto err_exts_init; 216 217 if (!handle) 218 handle = 1; 219 new->handle = handle; 220 new->flags = userflags; 221 new->pf = alloc_percpu(struct tc_matchall_pcnt); 222 if (!new->pf) { 223 err = -ENOMEM; 224 goto err_alloc_percpu; 225 } 226 227 err = mall_set_parms(net, tp, new, base, tb, tca[TCA_RATE], 228 flags, new->flags, extack); 229 if (err) 230 goto err_set_parms; 231 232 if (!tc_skip_hw(new->flags)) { 233 err = mall_replace_hw_filter(tp, new, (unsigned long)new, 234 extack); 235 if (err) 236 goto err_replace_hw_filter; 237 } 238 239 if (!tc_in_hw(new->flags)) 240 new->flags |= TCA_CLS_FLAGS_NOT_IN_HW; 241 242 *arg = head; 243 rcu_assign_pointer(tp->root, new); 244 return 0; 245 246 err_replace_hw_filter: 247 err_set_parms: 248 free_percpu(new->pf); 249 err_alloc_percpu: 250 tcf_exts_destroy(&new->exts); 251 err_exts_init: 252 kfree(new); 253 return err; 254 } 255 256 static int mall_delete(struct tcf_proto *tp, void *arg, bool *last, 257 bool rtnl_held, struct netlink_ext_ack *extack) 258 { 259 struct cls_mall_head *head = rtnl_dereference(tp->root); 260 261 head->deleting = true; 262 *last = true; 263 return 0; 264 } 265 266 static void mall_walk(struct tcf_proto *tp, struct tcf_walker *arg, 267 bool rtnl_held) 268 { 269 struct cls_mall_head *head = rtnl_dereference(tp->root); 270 271 if (arg->count < arg->skip) 272 goto skip; 273 274 if (!head || head->deleting) 275 return; 276 if (arg->fn(tp, head, arg) < 0) 277 arg->stop = 1; 278 skip: 279 arg->count++; 280 } 281 282 static int mall_reoffload(struct tcf_proto *tp, bool add, flow_setup_cb_t *cb, 283 void *cb_priv, struct netlink_ext_ack *extack) 284 { 285 struct cls_mall_head *head = rtnl_dereference(tp->root); 286 struct tc_cls_matchall_offload cls_mall = {}; 287 struct tcf_block *block = tp->chain->block; 288 int err; 289 290 if (tc_skip_hw(head->flags)) 291 return 0; 292 293 cls_mall.rule = flow_rule_alloc(tcf_exts_num_actions(&head->exts)); 294 if (!cls_mall.rule) 295 return -ENOMEM; 296 297 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack); 298 cls_mall.command = add ? 299 TC_CLSMATCHALL_REPLACE : TC_CLSMATCHALL_DESTROY; 300 cls_mall.cookie = (unsigned long)head; 301 302 err = tc_setup_offload_action(&cls_mall.rule->action, &head->exts, 303 cls_mall.common.extack); 304 if (err) { 305 kfree(cls_mall.rule); 306 307 return add && tc_skip_sw(head->flags) ? err : 0; 308 } 309 310 err = tc_setup_cb_reoffload(block, tp, add, cb, TC_SETUP_CLSMATCHALL, 311 &cls_mall, cb_priv, &head->flags, 312 &head->in_hw_count); 313 tc_cleanup_offload_action(&cls_mall.rule->action); 314 kfree(cls_mall.rule); 315 316 return err; 317 } 318 319 static void mall_stats_hw_filter(struct tcf_proto *tp, 320 struct cls_mall_head *head, 321 unsigned long cookie) 322 { 323 struct tc_cls_matchall_offload cls_mall = {}; 324 struct tcf_block *block = tp->chain->block; 325 326 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, NULL); 327 cls_mall.command = TC_CLSMATCHALL_STATS; 328 cls_mall.cookie = cookie; 329 330 tc_setup_cb_call(block, TC_SETUP_CLSMATCHALL, &cls_mall, false, true); 331 332 tcf_exts_hw_stats_update(&head->exts, cls_mall.stats.bytes, 333 cls_mall.stats.pkts, cls_mall.stats.drops, 334 cls_mall.stats.lastused, 335 cls_mall.stats.used_hw_stats, 336 cls_mall.stats.used_hw_stats_valid); 337 } 338 339 static int mall_dump(struct net *net, struct tcf_proto *tp, void *fh, 340 struct sk_buff *skb, struct tcmsg *t, bool rtnl_held) 341 { 342 struct tc_matchall_pcnt gpf = {}; 343 struct cls_mall_head *head = fh; 344 struct nlattr *nest; 345 int cpu; 346 347 if (!head) 348 return skb->len; 349 350 if (!tc_skip_hw(head->flags)) 351 mall_stats_hw_filter(tp, head, (unsigned long)head); 352 353 t->tcm_handle = head->handle; 354 355 nest = nla_nest_start_noflag(skb, TCA_OPTIONS); 356 if (!nest) 357 goto nla_put_failure; 358 359 if (head->res.classid && 360 nla_put_u32(skb, TCA_MATCHALL_CLASSID, head->res.classid)) 361 goto nla_put_failure; 362 363 if (head->flags && nla_put_u32(skb, TCA_MATCHALL_FLAGS, head->flags)) 364 goto nla_put_failure; 365 366 for_each_possible_cpu(cpu) { 367 struct tc_matchall_pcnt *pf = per_cpu_ptr(head->pf, cpu); 368 369 gpf.rhit += pf->rhit; 370 } 371 372 if (nla_put_64bit(skb, TCA_MATCHALL_PCNT, 373 sizeof(struct tc_matchall_pcnt), 374 &gpf, TCA_MATCHALL_PAD)) 375 goto nla_put_failure; 376 377 if (tcf_exts_dump(skb, &head->exts)) 378 goto nla_put_failure; 379 380 nla_nest_end(skb, nest); 381 382 if (tcf_exts_dump_stats(skb, &head->exts) < 0) 383 goto nla_put_failure; 384 385 return skb->len; 386 387 nla_put_failure: 388 nla_nest_cancel(skb, nest); 389 return -1; 390 } 391 392 static void mall_bind_class(void *fh, u32 classid, unsigned long cl, void *q, 393 unsigned long base) 394 { 395 struct cls_mall_head *head = fh; 396 397 tc_cls_bind_class(classid, cl, q, &head->res, base); 398 } 399 400 static struct tcf_proto_ops cls_mall_ops __read_mostly = { 401 .kind = "matchall", 402 .classify = mall_classify, 403 .init = mall_init, 404 .destroy = mall_destroy, 405 .get = mall_get, 406 .change = mall_change, 407 .delete = mall_delete, 408 .walk = mall_walk, 409 .reoffload = mall_reoffload, 410 .dump = mall_dump, 411 .bind_class = mall_bind_class, 412 .owner = THIS_MODULE, 413 }; 414 415 static int __init cls_mall_init(void) 416 { 417 return register_tcf_proto_ops(&cls_mall_ops); 418 } 419 420 static void __exit cls_mall_exit(void) 421 { 422 unregister_tcf_proto_ops(&cls_mall_ops); 423 } 424 425 module_init(cls_mall_init); 426 module_exit(cls_mall_exit); 427 428 MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>"); 429 MODULE_DESCRIPTION("Match-all classifier"); 430 MODULE_LICENSE("GPL v2"); 431